Display device

ABSTRACT

A display device includes a display panel, a light shielding unit and a back plate. The display panel includes a first substrate, a second substrate and an upper polarizer. The first substrate is disposed corresponding to the second substrate. The upper polarizer is disposed on the second substrate. The light shielding unit is connected to the upper polarizer. The first substrate is disposed on the back plate.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation Application (CA) of an earlier filed,pending, application, having application Ser. No. 15/793,680 and filedon Oct. 25, 2017, the content of which, including drawings, is expresslyincorporated by reference herein.

BACKGROUND Technical Field

The present disclosure relates to a display device that can improve thelight leakage issue.

Related Art

With the development of technologies, flat display devices have beenwidely applied to various fields. Due to the advantages such as lowpower consumption, less weight, compact size and less radiation, theliquid crystal display (LCD) devices have gradually replaced thetraditional cathode ray tube (CRT) display devices and been applied tovarious electronic products, such as mobile phones, portable multimediadevices, notebook computers, liquid crystal TVs and liquid crystalscreens.

The conventional LCD device includes a color filer (CF) substrate and athin-film-transistor (TFT) substrate, which are disposed opposite toeach other. The upper surface of the CF substrate is configured with apolarizer, and the lower surface of the TFT substrate is also configuredwith a polarizer. The polarizing axes of the two polarizerssubstantially have a phase difference of 90 degrees, and the lightcharacteristics can be modulated by controlling the intensity of theelectric field to bias the liquid crystals, thereby enabling the LCDdevice to display images.

In general, the area of the upper polarizer is smaller than the area ofthe upper surface of the CF substrate, and the area of the lowerpolarizer is smaller than the area of the lower surface of the TFTsubstrate. Accordingly, the polarizers may not fulfill the entire uppersurface of the CF substrate or the entire lower surface of the TFTsubstrate. When the light emitted from the backlight module passesthrough the display panel, the light may not only pass through thepolarizers but also the parts of the TFT substrate or the CF substrate,which is not covered by the polarizers (e.g. the edges of the CFsubstrate or the TFT substrate). This will cause the light leakage atthe edges of the display panel and thus affect the display quality.

Therefore, it is desired to provide a display device that can preventthe light leakage issue of the display panel so as to improve thedisplay quality.

SUMMARY

An objective of the disclosure is to provide a display device that canprevent the light leakage issue of the display panel so as to improvethe display quality.

The present disclosure provides a display panel including a displaypanel, a light shielding unit, a supporting unit and a backlight module.The display panel includes a first substrate and a first polarizer. Thefirst substrate has a first surface, and the first surface has a firstactive area and a first non-active area. The first non-active area isdisposed adjacent to the first active area, and the first polarizer isdisposed on the first active area. The light shielding unit is disposedon the first non-active area and connected to the first polarizer. Thesupporting unit is disposed corresponding to the light shielding unit.The backlight module is disposed corresponding to the display panel andincludes an optical film. The supporting unit is disposed between thelight shielding unit and the optical film, and the supporting unitcontacts the light shielding unit and the optical film.

The present disclosure also provides a display device, which includes adisplay panel, a light shielding unit, a supporting unit and a backlightmodule. The display panel includes a first substrate, a secondsubstrate, a first polarizer, and a second polarizer. The firstsubstrate is disposed corresponding to the second substrate. The firstsubstrate has a first surface away from the second substrate, and thefirst surface has a first active area and a first non-active area. Thefirst non-active area is disposed adjacent to the first active area, andthe first polarizer is disposed on the first active area. The secondsubstrate has a second surface away from the first substrate, and thesecond surface has a second active area and a second non-active area.The second non-active area is disposed adjacent to the second activearea, and the second polarizer is disposed on the second active area.The light shielding unit is disposed on the second non-active area ofthe second substrate and connected to the second polarizer. Thesupporting unit is disposed corresponding to the first non-active areaof the first substrate. The backlight module is disposed correspondingto the display panel and includes an optical film. The supporting unitis disposed between the first substrate and the optical film, and thesupporting unit contacts the first non-active area and the optical film.

The present disclosure further provides a display device including adisplay panel, a light shielding unit and a back plate. The displaypanel includes a first substrate, a second substrate and a polarizer.The first substrate is disposed corresponding to the second substrate.The second substrate has a surface away from the first substrate, andthe surface has an active area and a non-active area. The non-activearea is disposed adjacent to the active area, and the polarizer isdisposed on the active area. The light shielding unit is disposed on thenon-active area of the second substrate and connected to the polarizer.The first substrate is disposed on the back plate.

As mentioned above, in the display device of the disclosure, the lightshielding unit is disposed on the first non-active area or the secondnon-active area, and the light shielding unit is connected to the firstpolarizer or the second polarizer. Thus, the light emitted toward thedisplay panel can be blocked by the light shielding unit disposed on thefirst non-active area or the second non-active area. This configurationcan prevent the light leakage issue of the display panel and improve thedisplay quality.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will become more fully understood from the detaileddescription and accompanying drawings, which are given for illustrationonly, and thus are not limitative of the present disclosure, andwherein:

FIG. 1A is a sectional view of a part of a display device according toan embodiment of the disclosure;

FIG. 1B is a top view of the display device of FIG. 1A showing therelative positions of the first substrate, the first polarizer and thelight shielding unit;

FIG. 1C is a top view of a display device of another embodiment showingthe relative positions of the first substrate, the first polarizer andthe light shielding unit;

FIG. 1D is a perspective diagram showing parts of the light shieldingunit and the supporting unit according to an embodiment of thedisclosure;

FIG. 1E is a top view of a display device of another embodiment showingthe relative positions of the first substrate, the first polarizer andthe light shielding unit; and

FIGS. 2A to 2G are schematic diagrams showing the display devices ofdifferent aspects.

DETAILED DESCRIPTION OF THE DISCLOSURE

The embodiments of the disclosure will be apparent from the followingdetailed description, which proceeds with reference to the accompanyingdrawings, wherein the same references relate to the same elements.

Moreover, the drawings of all implementation are schematic, and they donot mean the actual size and proportion. The terms of direction recitedin the disclosure, for example up, down, left, right, front, or rear,only define the directions according to the accompanying drawings forthe convenience of explanation but not for limitation. In addition, ifone element is formed on, above, under, or below another element, thesetwo elements can be directly contacted with each other or not directlycontacted with each other but have an addition element disposedtherebetween. The numeral descriptions, such as the first, the secondand the third, are for identifying different components and are not forlimiting the order thereof. The names of elements and the wordingrecited in the disclosure all have ordinary meanings in the art unlessotherwise stated. Therefore, a person skilled in the art canunambiguously understand their meanings.

FIG. 1A is a sectional view of a part of a display device 1 according toan embodiment of the disclosure, and FIG. 1B is a top view of thedisplay device 1 of FIG. 1A showing the relative positions of the firstsubstrate 111, the first polarizer 113 and the light shielding unit 12.

As shown in FIGS. 1A and 1B, the display device 1 is a LCD device, whichincludes a display panel 11, a light shielding unit 12, and a supportingunit 13 and a backlight module 14. The backlight module 14 is disposedcorresponding to the display panel 11, and the light emitted from thebacklight module 14 passes through the display panel 11 so as to displayimages. The display panel 11 can be an FFS (Fringe Field Switching) LCDpanel, an IPS (In-plane switch) LCD panel, a TN (Twisted Nematic) LCDpanel, a VA mode (Vertical Alignment mode) LCD panel, or any one ofother types of LCD panels, and this disclosure is not limited.

As shown in FIG. 1A, the display panel 11 includes a first substrate111, a second substrate 112, a liquid crystal layer (not shown), a firstpolarizer 113 and a second polarizer 114. The first substrate 111 isdisposed opposite to the second substrate 112, and the liquid crystallayer is disposed between the first substrate 111 and the secondsubstrate 112. In some embodiments, the first substrate 111 or thesecond substrate 112 can be made of a material containing glass,plastics or quartz, and this disclosure is not limited. In someembodiments, the first substrate 111 or the second substrate 112 can bea flexible substrate, a rigid substrate, or a rigid-flex board, and thisdisclosure is not limited. In some embodiments, the first substrate 111or the second substrate 112 can be a capping layer or a barrier film,and this disclosure is not limited.

In this embodiment, the first substrate 111 is a TFT(thin-film-transistor) substrate, and the second substrate 112 is a CF(color filter) substrate. In other embodiments, the black matrix of theCF substrate can be formed on the TFT substrate, and the first substrate111 becomes a BOA (BM on array) substrate. Alternatively, the colorfilter layer of the CF substrate can be formed on the TFT substrate, andthe first substrate 111 becomes a COA (color filter on array) substrate.In some embodiments, the first substrate 111 can be a CF substrate andthe second substrate 112 can be a TFT substrate. This disclosure is notlimited.

In this embodiment, the first polarizer 113 is a lower polarizer, andthe second polarizer 114 is an upper polarizer. In another embodiment,the first polarizer 113 can be an upper polarizer, and the secondpolarizer 114 can be a lower polarizer. This disclosure is not limited.In this embodiment, the first polarizer 113 (lower polarizer) isdisposed at one side of the first substrate 111 away from the secondsubstrate 112, and the second polarizer 114 (upper polarizer) isdisposed at one side of the second substrate 112 away from the firstsubstrate 111. In this case, the first polarizer 113 is disposed on thefirst surface S1 (lower surface) of the first substrate 111, and thesecond polarizer 114 is disposed on the second surface S2 (uppersurface) of the second substrate 112. The polarizing axes of the firstpolarizer 113 and the second polarizer 114 substantially have a phasedifference of 90 degrees, and the characteristics of the light emittedfrom the backlight module 14 can be modulated by controlling theintensity of the electric field to bias the liquid crystals, therebyenabling the display panel 11 to display images. In other embodiments,other polarizers of different designs can also be applied based on therequirement, and this disclosure is not limited.

The first surface S1 of the first substrate 111 has a first active areaS11 and a first non-active area S12. The first non-active area S12 isdisposed adjacent to the first active area S11, and the first polarizer113 is disposed on the first active area S11. In other words, the firstactive area S11 is an area of the first surface S1 of the firstsubstrate for attaching the first polarizer 113, and the residual areaof the first surface S1 of the first substrate 111, which is notattached with the polarizer, is the first non-active area S12. Since thearea of the first polarizer 113 is smaller than the area of the firstsurface S1, a part of the first surface S1 is not covered by thepolarizer when attaching the first polarizer 113 on the first surfaceS1, and the residual area of the first surface S1, which is not attachedwith the polarizer, is the first non-active area S12. As shown in FIG.1B, the first non-active area S12 of the embodiment is disposed aroundthe first active area S11 of the first substrate 111 (e.g. four sides ofthe first active area S11). In other embodiments, the first non-activearea S12 can be disposed at one side, two sides, or three sides of thefirst surface S1 of the first substrate 111. This disclosure is notlimited.

Similarly, the second surface S2 of the second substrate 112 has asecond active area S21 and a second non-active area S22. The secondnon-active area S22 is disposed adjacent to the second active area S21,and the second polarizer 114 is disposed on the second active area S21.In other words, since the area of the second polarizer 114 is smallerthan the area of the second surface S2, a part of the second surface S2is not covered by the polarizer when attaching the second polarizer 114on the second surface S2, and the residual area of the second surfaceS2, which is not attached with the polarizer, is the second non-activearea S22. In this embodiment, the second non-active area S22 is disposedaround the second active area S21 of the second substrate 112 (e.g. foursides of the second active area S21). In other embodiments, the secondnon-active area S22 can be disposed at one side, two sides, or threesides of the second surface S2 of the second substrate 112. Thisdisclosure is not limited.

As shown in FIG. 1A, the light shielding unit 12 is disposed on thefirst non-active area S12 of the first surface S1 and connected to thefirst side surface S3 of the first polarizer 113. As shown in FIG. 1B,the light shielding unit 12 is disposed on the first non-active area S12and connected to four sides of the first polarizer 113. In moredetailed, the light shielding unit 12 is disposed on the firstnon-active area S12, so the first polarizer 113 and the light shieldingunit 12 is substantially located on the first surface S1 of the firstsubstrate 111. In other embodiments, the light shielding unit 12 can bedisposed at one side, two sides or three sides of the first non-activearea S12, or it can include a plurality of separated segments disposedon the first surface S1. This disclosure is not limited.

As shown in FIG. 1C, the light shielding unit 12 includes a plurality ofseparated segments disposed at four sides of the first non-active areaS12. In one embodiment, the side of some segments (e.g. the segment 121)of the light shielding unit 12 can be a smooth straight line. In oneembodiment, the side of some segments (e.g. the segment 122) of thelight shielding unit 12 can be an irregular surface. In one embodiment,the segments of the light shielding unit 12 may have different lengths,and one side of the first non-active area S12 can be configured with aplurality of segments of the same length or different lengths. In oneembodiment, the surface of the light shielding unit 12, which contactswith the supporting unit 13, can be a smooth surface or an irregularsurface, and this disclosure is not limited. The light shielding unit ofthe disclosure can be the combinations of any of above aspects, and thisdisclosure is not limited.

The light shielding unit 12 is made of insulation material such as, forexample but not limited to, acrylic glue. The resistance of the lightshielding unit 12 is between 10⁸Ω and 10¹⁵Ω (10⁸Ω≤resistance≤10¹⁵Ω). Inother embodiments, the resistance of the light shielding unit 12 can bebetween 10¹⁰Ω and 10¹⁵Ω (10¹⁰Ω≤resistance≤10¹⁵Ω). In order to providethe light shielding effect, the light shielding unit 12 is black, andthis disclosure is not limited. In other embodiments, the lightshielding unit 12 can be gray or other color with low transmittance. Thetransmittance can be defined by the optical density (OD) of thematerial, which can be measured by illuminometer. In this embodiment,the optical density of the light shielding unit 12 is, for example,greater than or equal to 1 and is less than or equal to 4 (1≤OD≤4). Inother embodiments, the optical density of the light shielding unit 12can be, for example, greater than or equal to 2 and is less than orequal to 4 (2≤OD≤4). If the optical density of 2 represents thetransmittance of 1/100, and the optical density of 4 represents thetransmittance of 1/10000.

In some embodiment, the light shielding unit 12 is made of black lightshielding glue or light shielding tape, and this disclosure is notlimited. The viscosity of the light shielding glue can be greater thanor equal to 100 CP (centipoise) and be smaller than or equal to 1000 CP(100 CP≤viscosity≤1000 CP). In other embodiments, the viscosity of thelight shielding glue can be greater than or equal to 350 CP and besmaller than or equal to 750 CP (350 CP≤viscosity≤750 CP). In otherembodiment, the viscosity of the light shielding glue can be greaterthan or equal to 400 CP and be smaller than or equal to 500 CP (400CP≤viscosity≤500 CP). For example, the viscosity of the light shieldingglue can be 450 CP. The light shielding glue can be disposed on thefirst non-active area S12 by coating. In some embodiment, in order toensure the contact between the first polarizer 113 and the first sidesurface S3, the light shielding glue can be applied from the firstnon-active area S12 to the covering layer (not shown) of the firstpolarizer 113. Since the first side surface S3 of the first polarizer113 has a certain thickness, the light shielding glue may have a gapduring the coating process due to this thickness of the first sidesurface S3, and be remained on the first non-active area S12 and thecovering layer of the first polarizer 113. Accordingly, the lightshielding glue applied on the first polarizer 113 can be easily removedby tearing off the covering layer of the first polarizer 113 after thesolidification of the light shielding glue. Thus, the formed lightshielding glue can be stopped at and fulfill the entire first sidesurface S3 of the first polarizer 113. Afterwards, the light shieldingglue disposed on the first non-active area S12 is solidified to form thelight shielding unit 12. In other embodiments, the light shielding gluecan be disposed on the entire first non-active area S12 or on a part ofthe first non-active area S12, and this disclosure is not limited. Inaddition, the light shielding unit can be formed by other methods suchas attaching, and this disclosure is not limited.

The thickness of the light shielding unit 12 is smaller than thethickness of the first polarizer 113. In some embodiment, as shown inFIG. 1A, the thickness d1 of the light shielding unit 12 is greater thanor equal to 1/12 of the thickness d2 of the first polarizer 113 and issmaller than or equal to the thickness d2 of the first polarizer 113(d2/12≤d1≤d2). In other embodiments, the thickness d1 of the lightshielding unit 12 can be greater than or equal to 1/12 of the thicknessd2 of the first polarizer 113 and be smaller than or equal to ½ of thethickness d2 of the first polarizer 113 (d2/12≤d1≤d2/2). In oneembodiment, the thickness of the first polarizer 113 is, for example,180 μm, and the thickness of the light shielding unit 12 is greater thanor equal to 15 μm and is smaller than or equal to 20 μm. In someembodiments, the light shielding unit 12 is formed by coating a lightshielding glue, so the surface of the light shielding unit 12 may be nota planar surface. Thus, the above-mentioned thickness of the lightshielding unit 12 is the “average thickness” of the light shielding unit12.

As shown in FIG. 1A, the supporting unit 13 is disposed corresponding tothe light shielding unit 12, and the supporting unit 13 is positionedbetween the backlight module 14 and the display panel 11. In thisembodiment, the supporting unit 13 is disposed between the lightshielding unit 12 and the optical film 143, and the supporting unit 13contacts the light shielding unit 12 and the optical film 143 of thebacklight module 14 for supporting the display panel 11. Herein, thesupporting unit 13 can be a spacer or other components for supportingthe display panel 11 or configuring between the display panel 11 and thebacklight module 14. This disclosure is not limited. In addition, thesupporting unit 13 can be made of, for example but not limited to, UVglue or tape. The thickness d3 of the supporting unit 13 can be thedistance protruding beyond the light shielding unit 12 towards thebacklight module 14. The sum of the thickness d1 of the light shieldingunit 12 and the thickness d3 of the supporting unit 13 is greater thanor equal to the thickness d2 of the first polarizer 113 ((d1+d3)≥d2). Insome embodiments, the supporting unit 13 can cover the entire lightshielding unit 12 or a part of the light shielding unit 12. In someembodiments, the supporting unit 13 can be a single piece of component,a component having multiple segments, or composed of a plurality ofparts, and this disclosure is not limited. The above-mentioned shapes ofthe supporting unit 13 are for illustrations, and in other embodiments,the supporting unit 13 may have any of other shapes. This disclosure isnot limited.

The backlight module 14 further includes an optical unit 141, areflective unit 142, an optical film 143, and a back plate 144. When thebacklight module 14 is an edge-type backlight module, the optical unit141 is a light guiding plate. The optical unit 141 can be made oftransparent materials, such as acrylic resin, polycarbonate,polyethylene resin, or glass, and this disclosure is not limited. Inaddition, the cross-section of the optical unit 141 may have a plateshape, a wedge shape, or other shapes, and this disclosure is notlimited. In this embodiment, the backlight module 14 is an edge-typebacklight module, and the optical unit 141 is a light guiding plate.Accordingly, the light-emitting unit (not shown) can emit light, and thelight enters the light guiding plate through the light input surface(side surface) and is then outputted through the light output surface(top surface) of the light guiding plate, thereby providing a surfacelight to the display panel 11. When the backlight module 14 is adirect-type backlight module, the optical unit 141 is a LED matrixlayer, and this disclosure is not limited.

The reflective unit 142 is disposed on the bottom surface of the opticalunit 141 for reflecting the light outputted from the bottom surface ofthe optical unit 141 back to the optical unit 141 to increase theutility of the light. The reflective unit 142 can be a reflective layer(e.g. a metal coating layer) or a reflective plate. In this embodiment,the reflective unit 142 is a reflective plate. The reflective unit 142includes a reflective material such as metal, metal oxide, highreflective paint (white paint), or their combinations, and thisdisclosure is not limited.

The optical film 143 is disposed on the light output surface (the topsurface) of the optical unit 141. In this embodiment, the backlightmodule 14 includes four stacked optical films (all have the samereference number 143) disposed on the optical unit 141. In otherembodiments, the backlight module 14 may have multiple optical films ofother numbers, and this disclosure is not limited. The optical film 143is, for example but not limited to, a diffuser, a 90° collector, a 0°collector, a prism sheet, a brightness enhancement film, or otheroptical films, or any of their combinations. The optical film(s) 143 cantransform the light outputted from the optical unit 141 into a uniformsurface light source.

The back plate 144 is configured to support the optical unit 141, thereflective unit 142 and the optical film 143 as well as the displaypanel 11 for providing the protections to collision, electromagneticwave, electric shock, or moisture. In this embodiment, the back plate144 is made of plastics, metals, alloys, polyesters, carbon fibers, orany of their combinations, and this disclosure is not limited. In someembodiments, the back plate 144 can be a supporting frame, which is madeof metals, alloys, or plastics, and this disclosure is not limited.

In the display device 1 of this embodiment, the light shielding unit 12is disposed on the first non-active area S12 of the first substrate 111and is connected to the first side surface S3 of the first polarizer113, so the light emitted from the backlight module 14 to the displaypanel 11 can be blocked by the light shielding unit 12 disposed on thefirst non-active area S12. Accordingly, the light cannot pass throughthe edges of the display panel 11 and irradiate the internal components(not shown) of the display panel 11. This configuration can prevent thelight leakage issue of the display panel 11 and thus improve the displayquality.

To be noted, although the light shielding unit 12 is disposed on thefirst non-active area S12 of the first substrate 111 and is connected tothe first side surface S3 of the first polarizer 113, a gap may existbetween the light shielding unit 12 (the side surface) and the side wall1441 of the back plate 144 of the backlight module 14, which may causethe light leakage. Accordingly, in some embodiments, the light shieldingunit 12 may extend from the first non-active area S12 of the firstsubstrate 111 to the side wall 1441 of the back plate 144 and connect tothe side wall 1441 (not shown). This configuration can prevent the lightfrom passing through the gap between the side wall 1441 and the lightshielding unit 12 (light leakage). In some embodiments, the back plate144 may be attached to the side surface of the display panel 11 tightlyand directly connected to the light shielding unit 12, and thisdisclosure is not limited.

The metal oxide thin-film transistors are the commonly used driving unitfor the display panel. However, the metal oxide thin-film transistorsmay easily generate threshold voltage shifting after irradiated bylight, which will cause the hotspots of the display panel. In thisdisclosure, the metal oxide thin-film transistors disposed at thenon-active area (e.g. the metal oxide thin-film transistors of the gatdriver on panel (GOP)) can be covered, and the undesired light leakingfrom the non-active area to the active area to affect the metal oxidethin-film transistors disposed at the active area can be prevented. Thisdisclosure can avoid the light leakage through the non-active area ofthe panel and prevent the hotspots, and this disclosure is not limited.The above-mentioned metal oxide is, for example, IGZO (Indium GalliumZinc Oxide).

In other embodiments, the light shielding unit 12 can be formed byattaching a light shielding tape. FIG. 1D is a perspective diagramshowing parts of the light shielding unit 12 and the supporting unit 13according to an embodiment of the disclosure, and FIG. 1E is a top viewof a display device of another embodiment showing the relative positionsof the first substrate 111, the first polarizer 113 and the lightshielding unit 12.

In the embodiment of FIG. 1D, the light shielding unit 12 is, forexample but not limited to, a single-sided adhesive, and the supportingunit 13 is, for example but not limited to, a spacer or a buffer forproviding a spacing or buffering function. In addition, as shown in FIG.1E, the first non-active area S12 is located on the top side, the leftside and the right side of the first surface S1 of the first substrate111, and the bottom side of the first surface S1 does not configure withthe non-active area. Moreover, in the top view of FIG. 1E, a part of thelight shielding unit 12 protrudes beyond the top side, the bottom sideand the right side of the first surface S1. In practice, in order toprovide the light shielding and fixing functions, the part of the lightshielding unit 12 protruding beyond the top side, the bottom side andthe right side of the first surface S1 is bent toward the backlightmodule and attached to the backlight module, so it is not shown in thetop view. In this embodiment, the light shielding unit 12 and thesupporting unit 13 are disposed at the right side of the first substrate111, and a part of the light shielding unit 12 protrudes beyond the topside, the bottom side and the right side of the first surface S1. Theprotruding part of the light shielding unit 12 can be bent toward andattached to the backlight module, so that the light shielding unit 12can be fixed on the backlight module. The protruding part of the lightshielding unit 12 of FIG. 1E is for an example. In other embodiments,the light shielding unit 12 may protrude beyond the other sides (e.g.the left side) of the first surface S1. The light shielding unit 12 mayhave the same protruding configuration, or any combination of the topside, the bottom side and the right side, and this disclosure is notlimited.

FIGS. 2A to 2G are schematic diagrams showing the display devices 1 a˜1g of different aspects.

Different from the display device 1 of FIG. 1A, the light shielding unit12 of the display device 1 a of FIG. 2A is disposed on the firstnon-active area S12 of the first substrate 111 and is further disposedon the second side surface S4 of the first substrate 111 and extended tothe third side surface S5 of the second substrate 112. In other words,the light shielding unit is disposed on the second side surface S4 ofthe first substrate 111 and the third side surface S5 of the secondsubstrate 112. Accordingly, the light shielding unit 12 can block thelight emitted from the backlight module 14 to the first non-active areaS12 and further block the light emitted from the backlight module 14 tothe interval between the second side surface S4 of the first substrate111 and the side wall 1441 of the back plate 144.

Different from the display device 1 of FIG. 1A, the light shielding unit12 of the display device 1 b of FIG. 2B is disposed on the firstnon-active area S12 of the first substrate 111 and is further disposedon the second non-active area S22 of the second substrate 112 andconnected to the fourth side surface S6 of the second polarizer 114. Insome embodiments, the light shielding unit 12 is disposed on the secondnon-active area S22 and connected to, for example, four fourth sidesurfaces S6 of the second polarizer 114. In other embodiments, the lightshielding unit 12 is disposed on a part of the second non-active areaS22, and this disclosure is not limited. In addition, the lightshielding unit 12 can be extended from the first non-active area S12 ofthe first substrate 111 to the side wall 1441 of the back plate 144 andconnected to the side wall 1441 (not shown). This configuration canprevent the light leakage through the gap between the side wall 1441 andthe side surface of the light shielding unit 12.

Different from the display device 1 b of FIG. 2B, the light shieldingunit 12 of the display device 1 c of FIG. 2C is further disposed on thesecond side surface S4 of the first substrate 111 and the third sidesurface S5 of the second substrate 112.

Different from the display device 1 of FIG. 1A, the first substrate 111of the display device 1 d of FIG. 2D is a CF substrate, and the secondsubstrate 112 is a TFT substrate. In addition, the light shielding unit12 is disposed on the first non-active area S12 of the first substrate111 (CF substrate) and connected to the first side surface S3 of thefirst polarizer 113, and is further extended to the second side surfaceS4 of the first substrate 111, the third side surface S5 of the secondsubstrate 112, and the further side surface S6 of the second polarizer114. Moreover, the supporting unit 13 of this embodiment is, forexample, a sealant and is disposed between the side wall 1441 and thelight shielding unit 12. The supporting unit 13 contacts the side wall1441, the light shielding unit 12, the second polarizer 114 and theoptical film 143 of the backlight module 14, so that the display panel11 can be carried by the backlight module 14 via the supporting unit 13,and the backlight module 14 is disposed opposite to the display panel11. In this embodiment, the supporting unit 13 has a reverse L shape. Apart of the supporting unit 13 is disposed between the light shieldingunit 12 and the side wall 1441 of the back plate 144, and a part of thesupporting unit 13 is disposed between the second polarizer 114 and theoptical film 143. In addition, the second polarizer 114 is fullyattached on the second surface S2 of the second substrate 112. In otherwords, the area of the second polarizer 114 is similar to the area ofthe second substrate 112, and the second non-active area S22 is almostnot existed.

Similar to the display device 1 a of FIG. 1A, the display device 1 e ofFIG. 2E includes a display panel 11, a light shielding unit 12, asupporting unit 13 and a backlight module 14. In this embodiment, thefirst polarizer 113 is disposed on the first active area S11 of thefirst substrate 111, and the second polarizer 114 is disposed on thesecond active area S21 of the second substrate 112. The first substrate111 is a TFT substrate, and the second substrate 112 is a CF substrate.Different from the display device 1 a, the light shielding unit 12 ofthis embodiment is disposed on the second non-active area S22 of thesecond substrate 112, and connected to the fourth side surface S6 of thesecond polarizer 114. Besides, the light shielding unit 12 extends fromthe second non-active area S22 to the side wall 1441 of the back plate144 and connects to the side wall 1441. This configuration can preventthe light from passing through the gap between the side wall 1441 andthe third side surface S5 or the second side surface S4, which may causethe undesired light leakage. The light shielding unit 12 can be disposedon the entire second non-active area S22 of the second substrate 112 (CFsubstrate) or on a part of the second non-active area S22 of the secondsubstrate 112, and this disclosure is not limited. In addition, thesupporting unit 13 of this embodiment can be correspondingly disposed onthe first non-active area S12 of the first substrate 111 and locatedbetween the first substrate 111 and the optical film 143, and thesupporting unit 13 contacts the first non-active area S12 and theoptical film 143.

As shown in FIG. 2F, the light shielding unit 12 and the supporting unit13 of this embodiment are corresponding to the embodiments of FIGS. 1Dand 1E. In this case, the light shielding unit 12 is a single-sidedadhesive tape, and the supporting unit 13 is a spacer or a buffer. Thelight shielding unit 12 is connected to the supporting unit 13 and thelower surface of the first polarizer 113, and the supporting unit 13 isdisposed corresponding to the light shielding unit 12. The supportingunit 13 can be disposed between the light shielding unit 12 and theoptical film 143 of the backlight module 14, and the supporting unit 13contacts the light shielding unit 12 and the optical film 143. Inaddition, the back plate 144 has a side wall 1441. In this embodiment,the part of the side wall 1441 of the back plate 144 extending to thedisplay panel 11 is shorter, and the height thereof is, for example,equal to the height of the optical film 143. The supporting unit 13 isdisposed between the side wall 1441 and the light shielding unit 12, andthe supporting unit 13 contacts the side wall 1441 and the lightshielding unit 12. In this embodiment, the light shielding unit 12further extends from the place above the supporting unit 13 to the placeabove the side wall 1441 of the back plate 144, and is then bentdownwardly. Thus, the light shielding unit 12 can be disposed on thefifth side surface S7 of the side wall 1441, which is away from theoptical film 143, and attached to the side wall 1441. Accordingly, thelight shielding unit 12 can block the light emitted from the backlightmodule 14 to the display panel 11, and the light leakage issue of thedisplay panel 11 can be prevented so as to improve the display quality.In other embodiments, on side of the light shielding unit 12 facing thedisplay panel 11 can be configured with an adhesive layer (not shown)for enhancing the connecting strength between the display panel 11 andthe backlight module 14. The adhesive layer can be disposed on a part ofthe light shielding unit 12 to be adhered to other components, and thisdisclosure is not limited. In some embodiments, the light shielding unit12 can be disposed on the first non-active area S12 of the firstsubstrate 111 and contacts the first side surface S3 of the firstpolarizer 113. The supporting unit 13 is disposed between the firstpolarizer 113 and the optical film 143 and contacts the first polarizer113 and the optical film 143. This disclosure is not limited.

In addition, the display device if of this embodiment further includes afixing unit 15. The fixing unit 15 is an exposed component and contactsthe fourth side surface S6 of the second polarizer 114. The fixing unit15 can extend from the fourth side surface S6 and disposed between thedisplay panel 11 and the side surface of the backlight module 14, andcover a part of the bottom surface of the back plate 144. Thus, thelight shielding unit 12 is further disposed between the side wall 1441and the fixing unit 15, and the light shielding unit 12 contacts theside wall 1441 and the fixing unit 15. In other embodiments, the fixingunit 15 and the fourth side surface S6 of the second polarizer 114 mayhave a gap therebetween, and this disclosure is not limited. Theconfiguration of the fixing unit 15 can enhance the connecting strengthbetween the display panel 11 and the backlight module 14, or make thedisplay device if with a beautiful appearance.

As shown in FIG. 2G, the display device 1 g of this embodiment is anOLED (organic light-emitting diode) display device, which includes adisplay panel 11, a light shielding unit 12 and a back plate 144.

The display panel 11 includes a first substrate 111, a second substrate112 and a polarizer 114. The first substrate 111 is disposed opposite tothe second substrate 112. A display intermedium layer is disposedbetween the first substrate 111 and the second substrate 112. In thisembodiment, the first substrate 111 can be a TFT substrate, the displayintermedium layer is an OLED layer (not shown), and the second substrate112 is a protection substrate (or a cover layer) for protecting the OLEDlayer and the TFT substrate from the external moisture and dusts. Insome embodiments, the first substrate 111 or the second substrate 112can be a flexible board, a rigid board or a flex-rigid board, and thisdisclosure is not limited.

The second substrate 112 has a surface S2 away from the first substrate111, and the surface S2 has an active area S21 and a non-active areaS22. The non-active area S22 is disposed adjacent to the active areaS21, and the polarizer 114 is disposed on the active area S21. In otherwords, since the area of the polarizer 114 is smaller than the area ofthe surface S2, a part of the surface S2 is not covered by the polarizerwhen attaching the polarizer 114 on the surface S2, and the residualarea of the surface S2, which is not attached with the polarizer, is thenon-active area S22. In this embodiment, the non-active area S22 isdisposed around the active area S21 of the second substrate 112 (e.g.four sides of the active area S21). In other embodiments, the non-activearea S22 can be disposed at one side, two sides, or three sides of thesurface S2 of the second substrate 112. This disclosure is not limited.In addition, the polarizer 114 is, for example but not limited to, a ¼λcircular polarizer for improving the display quality of the displaydevice 1 g.

In one embodiment, the viscosity of the light shielding glue (the lightshielding unit 12) can be greater than or equal to 100 CP and be smallerthan or equal to 1000 CP (100 CP≤viscosity≤1000 CP). The thickness d1 ofthe light shielding unit 12 is smaller than or equal to the thickness d2of the polarizer 114. In one embodiment, the thickness d1 of the lightshielding unit 12 is greater than or equal to 0 and is smaller than orequal to the thickness d2 of the polarizer 114 (0≤d1≤d2). In oneembodiment, the thickness d1 of the light shielding unit 12 is greaterthan or equal to 0 and is smaller than or equal to ½ of the thickness d2of the polarizer 114 (0≤d1≤d2/2). In one embodiment, the thickness d1 ofthe light shielding unit 12 is greater than or equal to 1/30 of thethickness d2 of the polarizer 114 and is smaller than or equal to ½ ofthe thickness d2 of the polarizer 114 (d2/30≤d1≤d2/2). In otherembodiments, the thickness d1 of the light shielding unit 12 is greaterthan or equal to 1/30 of the thickness d2 of the polarizer 114 and issmaller than or equal to ⅓ of the thickness d2 of the polarizer 114(d2/30≤d1≤d2/3). In one embodiment, the thickness of the light shieldingunit 12 is greater than or equal to 15 μm and is smaller than or equalto 20 μm. In some embodiments, the light shielding unit 12 is formed bycoating a light shielding glue, so the surface of the light shieldingunit 12 may be not a planar surface. Thus, the above-mentioned thicknessof the light shielding unit 12 is the “average thickness” of the lightshielding unit 12. The other technical features (e.g. the resistance,viscosity, and the likes) of the light shielding unit 12 of thisembodiment can be referred to the light shielding unit 12 of FIG. 1A, sothe detailed descriptions thereof will be omitted.

In addition, the light shielding unit 12 can be disposed on thenon-active area S22 of the second substrate 112, and the light shieldingunit 12 is connected to the fourth surface S6 of the polarizer 114 andis not extended to the back plate 144. In some embodiments, as shown inFIG. 2E, the light shielding unit 12 extends from the non-active areaS22 to the side wall 1441 of the back plate 144 and connects to the sidewall 1441. This configuration can prevent the light from passing throughthe gap between the side wall 1441 and the side surface of the firstsubstrate 111, which may cause the undesired light leakage. In thisembodiment, the light shielding unit 12 is formed by coating the lightshielding glue, and is an additional component other than the blackmatrix (BM) disposed inside the display panel 11, which can also providethe light shielding function. Thus, the manufacturing process of thelight shielding unit 12 is different from the manufacturing process ofthe black matrix, and this disclosure is not limited. In otherembodiments, which are not shown in the figures, the light shieldingunit 12 can be disposed on the display area of the display panel 11 forpreventing the light mixing between the subpixels of the display panel,so the function of the light shielding unit 12 is similar to the blackmatrix. In some embodiments, the light shielding unit 12 is disposedaround the first polarizer 113.

The back plate 144 supports the display panel 11, and the firstsubstrate 111 is disposed on the back plate 144. In some embodiments,the first substrate 111 contacts the back plate 144. The back plate 144can provide a protection for protecting the display panel 11 from tocollision, electromagnetic wave, electric shock, or moisture. In thisembodiment, the back plate 144 is made of plastics, metals, alloys,polyesters, carbon fibers, or any of their combinations, and thisdisclosure is not limited. In some embodiments, the back plate 144 canbe a supporting frame, which is made of metals, alloys, or plastics, andthis disclosure is not limited.

The other technical features of the display devices 1 a-1 g can bereferred to the display device 1, so the detailed descriptions thereofwill be omitted.

To be noted, the configurations of the light shielding unit 12, the backplate 144 and/or other components of the above-mentioned display devices1 and 1 a-1 g can be optionally selected based on the requirements, andthis disclosure is not limited. In addition, one side of the reflectiveunit 142 is even with the optical unit 141. In other embodiments, thereflective unit 142 can be smaller than the optical unit 141, and beadhered between the optical unit 141 and the back plate 144 bydouble-sided glue for enhancing the connection strength between theoptical unit 141 and the back plate 144. In addition, the display deviceof this disclosure can be a flexible display device, a curved surfacedisplay device, a touch display device, or any of other types of displaydevices, and this disclosure is not limited. In other embodiments, thelight shielding unit 12 of the disclosure can be used in other displaydevices composed of other display intermedium for providing the desiredlight shielding function. The display device can be an OLED displaydevice, a micro LED display device, a QD (quantum dot) display device,or any of other types of display devices, and this disclosure is notlimited.

To sum up, in the display device of the disclosure, the light shieldingunit is disposed on the non-active area or the side surface of the firstsubstrate, and the light shielding unit is connected to the side surfaceof the first polarizer or the second polarizer. Thus, the light emittedfrom the backlight module to the display panel can be blocked by thelight shielding unit, and the light cannot pass through the edge of thedisplay panel. This configuration can prevent the light leakage issue ofthe display panel and improve the display quality.

Although the disclosure has been described with reference to specificembodiments, this description is not meant to be construed in a limitingsense. Various modifications of the disclosed embodiments, as well asalternative embodiments, will be apparent to persons skilled in the art.It is, therefore, contemplated that the appended claims will cover allmodifications that fall within the true scope of the disclosure.

What is claimed is:
 1. A display device, comprising: a display panelcomprising a first substrate, a second substrate and an upper polarizer,wherein the first substrate is disposed corresponding to the secondsubstrate, and the upper polarizer is disposed on the second substrate;a light shielding unit connected to the upper polarizer and a side wall,wherein the side wall is located outside the display panel, and thelight shielding unit is between the upper polarizer and the side wall;and a supporting unit disposed under the light shielding unit, whereinthe supporting unit supports the display panel, and at least a part ofthe supporting unit corresponds to the light shielding unit, wherein amaximum elevation of the side wall is higher than a maximum elevation ofa top surface of the display panel, and wherein the light shielding unithas an irregular surface, and in a top view, at least part of theirregular surface has a wavy edge.
 2. The display device of claim 1,wherein the light shielding unit is disposed on a side surface of thesecond substrate.
 3. The display device of claim 1, wherein the firstsubstrate or the second substrate is a flexible board.
 4. The displaydevice of claim 1, wherein a thickness of the light shielding unit isgreater than or equal to 15 μm and is less than or equal to 20 μm. 5.The display device of claim 1, wherein the light shielding unit isdisposed on a side surface of the first substrate.
 6. The display deviceof claim 1, wherein the display panel further comprising: a lowerpolarizer disposed on the first substrate.
 7. The display device ofclaim 6, wherein the light shielding unit is connected to the lowerpolarizer.
 8. The display device of claim 6, wherein an area of theupper polarizer is larger than an area of the lower polarizer in view ofthe top view.
 9. The display device of claim 6, wherein a width of theupper polarizer is larger than a width of the lower polarizer in view ofa sectional view of the display device.
 10. The display device of claim6, wherein an area of the light guiding plate is smaller than an area ofthe lower polarizer in view of the top view.
 11. The display device ofclaim 6, wherein an area of the upper polarizer is smaller than an areaof the lower polarizer in view of the top view of the display device.12. The display device of claim 6, wherein a width of the upperpolarizer is smaller than a width of the lower polarizer in view of asectional view of the display device.
 13. The display device of claim 1,further comprising: a backlight module disposed corresponding to thedisplay panel.
 14. The display device of claim 13, wherein the backlightmodule comprises a light guiding plate and a back plate.
 15. The displaydevice of claim 1, further comprising: a fixing unit disposed on thesecond substrate.
 16. The display device of claim 15, wherein the fixingunit is disposed corresponding to a side surface of the display paneland the side wall.
 17. The display device of claim 15, wherein thefixing unit contacts the display panel and a back plate, wherein theback plate comprises the side wall.
 18. The display device of claim 15,wherein a thickness of the fixing unit disposed on the second substrateis less than a thickness of the upper polarizer.